A1 Refereed original research article in a scientific journal
The Interacting Late-type Host Galaxy of the Radio-loud Narrow-line Seyfert 1 IRAS 20181-2244
Authors: M. Berton, E. Congiu, S. Ciroi, S. Komossa, M. Frezzato, F. Di Mille, S. Antón, R. Antonucci,
A. Caccianiga, P. Coppi, E. Järvelä, J. Kotilainen, A. Lähteenmäki, S. Mathur, S. Chen, V. Cracco,
G. La Mura, P. Rafanelli
Publisher: IOP PUBLISHING LTD
Publication year: 2019
Journal: The Astronomical Journal
Journal name in source: ASTRONOMICAL JOURNAL
Journal acronym: ASTRON J
Article number: 48
Volume: 157
Issue: 2
Number of pages: 7
ISSN: 0004-6256
eISSN: 1538-3881
DOI: https://doi.org/10.3847/1538-3881/aaf5ca
Self-archived copy’s web address: https://research.utu.fi/converis/portal/detail/Publication/39178625
Narrow-line Seyfert 1 galaxies (NLS1s) are a class of active galactic nuclei that are known to be one of the few sources of gamma-rays, which originate in a relativistic beamed jet. Because of their relatively large distance, a poorly investigated aspect of these jetted NLS1s is their environment, and in particular, their host galaxy. In this work, we present the results of a morphological analysis of the host galaxy of the jetted NLS1 IRAS 20181-2244 observed with the 6.5 m Baade Telescope of the Las Campanas Observatory. The GALFIT analysis run on the Ks image, along with additional spectroscopic observations performed with the Nordic Optical Telescope, clearly revealed the presence of an interacting system of two galaxies. The data suggest that this NLS1 is hosted by a late-type galaxy, although the result is not conclusive. This analysis, along with other results in the literature, might suggest that two populations of jetted NLS1 exist. Further morphological studies are needed to confirm or disprove this hypothesis.
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